A group of pugs is called a grumble.
10
When cats are happy, they may squeeze their eyes shut.
10
Shark corneas are used in eye transplants and shark bone marrow can be used to graft human bones.
132
On some poorly researched trivia lists it is stated as a fact that a pregnant goldfish is called a twit. This is not true as goldfish lay eggs.
71
Parrotfish make themselves a kind of mucus 'sleeping bag' which masks their smell from predators and keeps parasites away.
4
The Basenji dog is the only dog that is not able to bark.
4
Some older/less efficient worker termites will develop 'backpacks' of toxic chemicals that explode when the termite is threatened. They are essentially used as suicide bombers when the colony is being attacked.
8